[wp-trac] [WordPress Trac] #52822: PHPMailer change in WordPress 5.7 breaks working sites

[WordPress Trac]

#52822: PHPMailer change in WordPress 5.7 breaks working sites
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 Reporter:  tigertech                |       Owner:  SergeyBiryukov
     Type:  defect (bug)             |      Status:  closed
 Priority:  high                     |   Milestone:  5.7.1
Component:  Mail                     |     Version:  5.7
 Severity:  normal                   |  Resolution:  fixed
 Keywords:  has-patch needs-testing  |     Focuses:
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Changes (by ocean90):

 * status:  reviewing => closed
 * resolution:   => fixed


Comment:

 In [changeset:"50628" 50628]:
 {{{
 #!CommitTicketReference repository="" revision="50628"
 External Libraries: Upgrade PHPMailer from 6.3.0 to 6.4.0.

 6.4.0 reverts a change that made the `mail()` and sendmail transports set
 the envelope sender if one isn't explicitly provided, as it was causing
 problems in specific PHP/server configurations.

 Release post: https://github.com/PHPMailer/PHPMailer/releases/tag/v6.4.0
 Changelog: https://github.com/PHPMailer/PHPMailer/compare/v6.3.0...v6.4.0

 Props Synchro, tigertech, ayeshrajans, galbaras, audrasjb, SergeyBiryukov,
 desrosj, ocean90.
 Fixes #52822.
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/52822#comment:24>
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